COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

The air is delivered ________ in one revolution in case of a three lobbed rotor.

Four times

Six times

Three times

Two times

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The mean effective pressure of the compressor is the

Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions

Volume of air delivered by the compressor

Volume of air sucked by the compressor during its suction stroke

None of these

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Mechanical efficiency of gas turbines as compared to I.C engines is

Lower

None of these

Same

Higher

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Adiabatic compression is one in which

Temperature during compression remains constant

No heat leaves or enters the compressor cylinder during compression

Work done is maximum

Temperature rise follows a linear relationship

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In a single stage, single acting reciprocating air compressor, without clearance volume, the work-done is minimum during

Polytropic compression

None of these

Isothermal compression

Isentropic compression

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In axial flow compressor, exit flow angle deviation from the blade angle is a function of

Blade camber and incidence angle

Space-chord ratio

Blade camber and space-chord ratio

Blade camber

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Volumetric efficiency of a compressor decreases with ________ in compression ratio.

Remain same

Does not change

Increase

Decrease

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A large clearance volume in a reciprocating compressor results in

Lower suction pressure

Reduced volume flow rate

Lower delivery pressure

Increased volume flow rate

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Only rocket engines can be propelled to space because

They are not air breathing engines

They can generate very high thrust

They have high propulsion efficiency

These engines can work on several fuels

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The maximum temperature in a gas turbine is

200°C

500°C

700°C

1000°C

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